Radio receiver



A. P. HULTGREN RADIO RECEIVERv Dec. 6, 1938.

'Filed April 5, 1957 QROZCZP/Yal Patented Dec. 6, 1938 PATENT OFFICE RADIO RECEIVER Arnold P. Hultgren, Chicago, Ill., assgnor to Sears, Roebuck and Co., Chicago, Ill., a, corporation of New York Application April 3, 1937, Serial No. 134,703

7 Claims.

'I'his invention relates to instruments operative .in different ranges of adjustment, and more par- .signal indicating the frequency range of operation of a radio set to one who may be too distant from the set to discern the station dial graduations.

Another object resides in the provision of different color signals for different frequency ranges in such manner that the station dial is illuminated with the selected color.

It is a further object to provide an improved color lter mounting.

Other objects and advantages of the invention will appear as the description proceeds.

In the accompanying drawing:-

Fig. 1 is a fragmentary front elevation of an instrument such as a radio embodying the invention.

Fig. 2 is a fragmentary sectional View taken on the line 2-2 in Fig. 1.

Fig. 3 is a development of a color lter iiag embodying the invention.

Referring now more particularly to the drawing, there is shown part of a radio including a cabinet I0 having a translucent station dial window I I adapted to be marked with suitable graduations to be indicated by a pointer or equivalent means (not shown) operative thruout each of a plurality of ranges or frequency bands. A lamp I2 mounted within the cabinet is arranged to illuminate the dial and preferably is energized and de-energized with the other radio apparatus.

The radio is equipped to operate in different frequency bands, for example in what is known as the broadcast band ranging from about 200 meters wave length to about 550 meters Wave length, and in longer and short-wave bands. The set is provided with a suitable switch (not shown) in the coil case I3 for selectively connecting the long and short-wave coils (not shown) into the radio circuit, the switch being controlled by a shaft I4 operated by means of an attached knob I5.

(Cl. 11G-124.1)

A flag I6 is non-rotatably mounted on the shaft and at its outer end has an opening I'I adapted, in one frequency range adjustment of the shaft, to be alined with the lamp and dial and, in another adjustment of the shaft, to be disalined with them. The opening is covered by a suitable color lter I8 by means of which the lamp illuminates the dial in any predetermined hue which will correspond for example to a selected short wave setting and so apprise the observer Whether he be close to or at a distance from the instrument. When the shaft is turned to cut out the previously selected short-wave coil and switch-in a long wave coil, for example, the filter is n o longer in the path of light from the lamp to the dial and thus white light or light of any readily observed hue other than that resulting from use of the filter illuminates the dial. This other hue is likewise communicated to the observer to immediately apprise him that the set is operating in long-wave.

The number of filters carried by the flag or shaft may be varied in accordance with the number of frequency ranges for which coils are provided or in which the set is designed to operate.

The filter support may be of any suitable construction. In the illustrated embodiment of the invention it comprises a strap which may be stamped or otherwise formed of sheet or other material toprovide a stem 2I terminating outwardly in a head or frame 22 to which a filter plate I8 of glass, mica, Celluloid, paper or equivalent material is secured in any suitable manner. The inner part of the stem has a hole 23 which may be of any suitable shape such as that of the body of the shaft I4, and another hole 24 of any suitable shape such as that of the end portion 26 of the shaft, the holes being formed in the arms of the U-shaped inner end of the strap as seen at 2l. The U formation makes for rigidity 4of the mounting of the strap on the shaft, and the non-circular' character of the intertting parts necessitates rotation of the strap with the shaft. The stem terminates inwardly in a tongue 29 overlying the fiat surface of the outer end of the shaft as shown at 30, both being received in a corresponding non-circular socket 3| in the knob so as to be frictionally held.

This mounting for the knob is sturdy as well as extremely simple, involving as it does a mini-v mum of parts of such form as to be readily adapted to 10W manufacturing cost. The invention, moreover, is readily adaptable to existing multifrequency range instruments without appreciable, if any, need for reorganization.

The invention has been described and illustrated as applied to a unitary device, but it will be appreciated that individual and subcornbination features of the device may be employed independently of the Whole and are therefore within the scope of the invention, as set forth in the appended claims.

It is obvious that various changes may be made in details of construction within the scope of the appended claims without departing from the spirit of the invention. t is therefore to be understood that this invention is not to be limited to the specific details disclosed.

i claim:

l. A radio set operative selectively in a plurality of frequency ranges and comprising means movable to establish each operative condition, a fixed dial for indicating the station to which the set is tuned in each range, and means controlled by the movable means for rendering the dial externally visible in a different hue for each range in which the set is operative.

2. A radio set operative selectively in a plurality of frequency ranges, comprising means movable to establish each operative condition, a light-parviens dial having a` series of graduations for indicating the station to which the set is tuned in both ranges, and means disposed rearwardly of the dial 'and controlled by the movable means for rendering said graduations externally visible in a different hue for each range in which the set is operative.

3. A radio set operative selectively in each of two frequency ranges, and comprising means movable to establish each operative condition, a light-pervious station dial having a single series of graduations serving both ranges, means for illuminating said graduations from the rear thereof in both ranges of operation, and lter means controlled by said movable means for altering the color of illumination of said graduations when the set is operative in one of the ranges.

4. A radio set operative in each of two freauency ranges, and comprising a dial having a single series of graduations functioning for both ranges, a shaft adapted to be turned to select the desired range of operation, a lamp arranged to illuminate said series in both ranges of operation, and a light filter mounted to turn with the shaft and arranged to intercept light from the lamp to impart an altered hue to said series when the set is operative in one range and to be moved by the shaft to an inoperative position when the set is adjusted to operate in the other range.

5. A radio set operative in each of two frequency bands, comprising a dial having a single series of graduations functioning for both bands, a shaft adapted to be turned to select the desired band, a lamp arranged to illuminate said series directly when one band is selected, and a color filter mounted to turn with said shaft and arranged during operation of said set in said one band to permit said series to be illuminated directly by said lamp, and to be interposed between said lamp and said series to impart a different hue te said series when the other `band is selected.

6. A multi-frequency band radio receiver having a shaft for selecting the bands, a relatively nxed light-perviousdial, means for illuminating said dial, a color lter mounted to rotate with said shaft and movable thereby into and out of position between the illuminating means and the dial according as one or another of the bands is selected, for coloring the dial correspondingly.

7. In combination with a multi-frequency band radio set including a switch for selecting each band and a dial and a lamp for illuminating the same, a. shaft rotatable to move said switch for selecting said bands, a color lterrotatable with said shaft and arranged tointercept light from the lamp to the dial except when a predetermined one of the bands is selected, and a mounting for filter, said mounting `comprising a member having a flat U-shaped portion affording spaced holes through which said shaft extends, one of holes and the corresponding portion of said shaft being non-circular to preclude relative turning of said shaft and member, and a handle retaining said member on said shaft.

ARNOLD P. HULTGREN.

CERTIFICATE OF CORRECTION., Patent No.` 2,159,082., December 6, 1958.

ARNOLD P. HULTGBMo It is herebyeertified that error appears in the printed specification of the above numb-ered patent requiring correction as fellows: Page 2, first `c o1umn, line 29, claimZ, for the words "the dial" read said graduations;

and second column, line 18, claim 5, for "illuminated" read illuminati; and

that the said Letters Patent shouldbe read with this correction therein that the same may conform to the record of the case in the Patent Office. signed and sealed this 28th day of March, A. D. 1959 Henry Van Arsdale (Seal) Acting Commissioner of Patents. 

